2128191 has 16 divisors (see below), whose sum is σ = 3082464. Its totient is φ = 1298304.

The previous prime is 2128183. The next prime is 2128201. The reversal of 2128191 is 1918212.

It is not a de Polignac number, because 2128191 - 2³ = 2128183 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2128391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7545 + ... + 7821.

It is an arithmetic number, because the mean of its divisors is an integer number (192654).

2^2128191 is an apocalyptic number.

2128191 is a deficient number, since it is larger than the sum of its proper divisors (954273).

2128191 is a wasteful number, since it uses less digits than its factorization.

2128191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490.

The product of its digits is 288, while the sum is 24.

The square root of 2128191 is about 1458.8320671003. The cubic root of 2128191 is about 128.6283999721.

The spelling of 2128191 in words is "two million, one hundred twenty-eight thousand, one hundred ninety-one".